Chemical Engineering MCQs

Page No. 29

Air filtration in a furnace___________________?


aReduces its thermal efficiency


bIs indicated by flame sting out


cIncreases the flue gas temperature


dNone of these



Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ °C?


a250


b650


c850


d1000


View Answer 650

Regenerators are used for waste heat recovery in____________________?


aBy-product coke ovens


bBeehive coke oven


cBlast furnace stoves


dSoaking pits


View Answer By-product coke ovens

Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?


a5


b60


c20


d40


View Answer 20

In a muffle furnace, the muffle_________________?


aRetards the heat transfer


bAssists in temperature equalisation in the charge


cPermits the use of controlled atmosphere for the protection of stock


dAll A., B. and C.


View Answer All A., B. and C.

Hearth furnaces are not used for____________________?


aRoasting


bMelting


cReheating


dNone of these


View Answer None of these

Decarburisation of steel__________________?


aIs the removal of carbon from iron carbide (Fe3C)


bAffects its crystalline structure


cIs favoured by CO2


dAll A., B. and C.


View Answer All A., B. and C.

Maximum heat transfer in high temperature furnaces is by____________________?


aConduction


bConvection


cRadiation


dEither A., B. or C.; depends on the type of furnace


View Answer Radiation

Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the_________________?


aQuantity & temperature of waste gas


bDust concentration & nature of dust in waste gas


cCorrosive nature of the waste gas


dAll A., B. and C.



Rate of heat release in a furnace, which is the measure of heat intensity, is defined as_________________?


akcal/hr/m3 combustion space


bkcal/m3 combustion space


ckcal/hr


dNone of these



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